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Simplifying 12 + -3x + -5 = 21 Reorder the terms: 12 + -5 + -3x = 21 Combine like terms: 12 + -5 = 7 7 + -3x = 21 Solving 7 + -3x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + -3x = 21 + -7 Combine like terms: 7 + -7 = 0 0 + -3x = 21 + -7 -3x = 21 + -7 Combine like terms: 21 + -7 = 14 -3x = 14 Divide each side by '-3'. x = -4.666666667 Simplifying x = -4.666666667
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